CN115584386A - Cooling method in die steel heat treatment process, heat treatment method of die steel and die steel - Google Patents
Cooling method in die steel heat treatment process, heat treatment method of die steel and die steel Download PDFInfo
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- CN115584386A CN115584386A CN202211294759.6A CN202211294759A CN115584386A CN 115584386 A CN115584386 A CN 115584386A CN 202211294759 A CN202211294759 A CN 202211294759A CN 115584386 A CN115584386 A CN 115584386A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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Abstract
The invention provides a cooling method in the heat treatment process of die steel, a heat treatment method of die steel and die steel, wherein the cooling method adopts water-air alternative cooling; the first water cooling time is the maximum effective thickness of the steel ingot (2.0-2.2) s/mm; the first air cooling time is the maximum effective thickness of the steel ingot (0.60-0.8) s/mm; the second water cooling time is the maximum effective thickness of the steel ingot (1.3-1.5) s/mm; the second air cooling time is the maximum effective thickness of the steel ingot (0.60-0.80) s/mm; the third water cooling time is the maximum effective thickness of the steel ingot (0.28-0.48) s/mm; the third air cooling time is 30-40 min. The invention utilizes the characteristics of strong cooling capacity of water and weak cooling capacity of air, and precisely optimizes the cooling control time through multiple times of alternate strong and weak cooling of water and air, so that the alloy structure of the steel ingot is more refined, and the toughness of the steel structure material is improved.
Description
Technical Field
The invention relates to the field of steel hot working, in particular to a cooling method in a die steel heat treatment process, and also relates to a die steel heat treatment method and die steel prepared by adopting the die steel heat treatment method.
Background
The mold is an indispensable basic tool in the manufacturing industry and is called as an industrial parent. China is the first major country of die manufacturing and consumption in the world, the yield value accounts for one third of the world, and with the rapid development of the fields of new energy automobiles, 5G communication, IT electronics, 3C household appliances and the like, the demand for high-quality die steel materials is more prominent. According to incomplete statistics, the total yield of the die steel in China is about 150 million tons, wherein the plastic die steel accounts for 60-70%, the hot die steel accounts for 20-25%, and the cold die steel accounts for about 15%.
At present, the preparation method of die steel in China mainly comprises smelting and forging, wherein the forged material accounts for more than 60 percent, and the rest is rolled material. The total net import of China is about 10 ten thousand tons each year. The import sources mainly include Japan Datong, hitachi metals, germany Purizz, sweden ASSAB, and American Fenkol. The grades of the imported die steel include Japanese SKD61, DC53, SKD11, etc., sweden 8407, DIEVAR, etc., germany 1.2344, 1.2379, U.S. grades H13, D2, etc. The specifications of the imported die steel mainly comprise large-size forging modules and large-size die flat steel. From the condition of downstream industries, the consumption die steel in the automobile industry accounts for about 35% of the total amount of the market, and the die steel for electronic communication industries such as computers, mobile phones, electronic equipment and the like accounts for about 20% of the market.
With the continuous expansion and high-end development of the application field of the die in the future, the die steel is inevitably developed towards the directions of various specifications, high purity, high tropism, ultra-fine structure and long service life in the face of the current situations of poor quality, performance stability and incomplete variety and specification of the die steel in China.
Disclosure of Invention
In view of the above, the present invention provides a cooling method in a heat treatment process of die steel, including: the method comprises the steps of alternately cooling a steel ingot by water and cooling the steel ingot by air; the first water cooling time is the maximum effective thickness of the steel ingot (2.0-2.2) s/mm; the first air cooling time is the maximum effective thickness of the steel ingot (0.60-0.8) s/mm; the second water cooling time is the maximum effective thickness of the steel ingot (1.3-1.5) s/mm; the second air cooling time is the maximum effective thickness of the steel ingot (0.60-0.80) s/mm; the third water cooling time is the maximum effective thickness of the steel ingot (0.28-0.48) s/mm; the third air cooling time is 30-40 min.
By adopting the cooling method in the heat treatment process of the die steel, water and air are adopted as media, and the characteristics of strong cooling capacity of water and weak cooling capacity of air are utilized, the cooling control time is accurately optimized through repeated strong and weak alternate cooling of water and air, so that the alloy structure of the steel ingot is more refined, and the toughness of the steel structure material is improved.
The invention also provides a heat treatment method of the die steel, which comprises the following steps: the steel ingot is sequentially treated according to the following steps: hot forging and rolling, air blowing and cooling, heating, alternately cooling in water and air, and spheroidizing annealing; wherein, the water-air alternative cooling adopts the cooling method in the heat treatment process of the die steel.
The heat treatment method of the die steel carries out hot forging rolling on the steel ingot to enable the steel ingot to be roughly processed and formed, then air blowing cooling is carried out to accelerate rapid cooling after hot forging rolling processing, crystal grains are refined, heating is further carried out to enable the steel ingot to be austenitized, water-air alternate cooling is continuously carried out, the alloy structure of the steel ingot is further refined, further spheroidizing annealing is carried out to eliminate stress of a workpiece in the water-air alternate cooling process, and the refined structure crystal grains are recrystallized.
Further, the final temperature of the hot forging and rolling of the steel ingot is above the precipitation temperature of secondary carbides in a CCT curve.
Further, the temperature of the steel ingot after air blowing and cooling is 230-250 ℃.
Further, the heating method comprises the following steps: heating the steel ingot to 600-680 ℃ at the speed of 90-100 ℃/h, and preserving heat for 2-3h; and then raising the temperature of the steel ingot to 1030-1050 ℃ at a speed of 90-100 ℃/h, and preserving the temperature for 2-3h.
Further, the spheroidizing annealing method comprises the following steps: heating the steel ingot to 600-680 ℃ at the speed of 90-100 ℃/h, and preserving heat for 3.5-4.5h; heating the steel ingot to 800-900 ℃ at the speed of 90-100 ℃/h, and preserving heat for 8.5-9.5h; cooling the steel ingot to 600-680 ℃ at a speed of less than or equal to 30 ℃/h; heating the steel ingot to 700-720 ℃ at a speed of 90-100 ℃/h, and preserving heat for 11-13 hours; and cooling the steel ingot to below 400 ℃ at a speed of less than or equal to 20 ℃/h, and discharging.
The invention further provides the die steel which is prepared from the steel ingot by the heat treatment method of the die steel.
By adopting the heat treatment method, the die steel can refine the steel structure and improve the toughness of the steel structure material.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a metallographic view of a die steel prepared by a heat treatment method of a die steel according to a first embodiment of the present invention, magnified 500 times at 1/2D;
FIG. 2 is a metallographic graph magnified 500 times at 1/2D of a die steel prepared by a heat treatment method of a die steel according to example two of the present invention;
FIG. 3 is a gold phase diagram magnified 500 times at 1/2D of a die steel prepared by a heat treatment method of a die steel of comparative example I.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The experimental procedures in the following examples are conventional unless otherwise specified. The test materials used in the following examples were all obtained from ordinary purchases unless otherwise specified. In addition, unless otherwise specified, all terms and processes related to the present embodiment should be understood according to the conventional knowledge and conventional methods in the art.
A cooling method in the heat treatment process of die steel, said method adopts entering water cooling and air cooling to the steel ingot to go on alternately; the first water cooling time is the maximum effective thickness of the steel ingot (2.0-2.2) s/mm; the first air cooling time is the maximum effective thickness of the steel ingot (0.60-0.8) s/mm; the second water cooling time is the maximum effective thickness of the steel ingot (1.3-1.5) s/mm; the second air cooling time is the maximum effective thickness of the steel ingot (0.60-0.80) s/mm; the third water cooling time is the maximum effective thickness of the steel ingot (0.28-0.48) s/mm; the third air cooling time is 30-40 min.
By adopting the cooling method in the heat treatment process of the die steel, water and air are adopted as media, the characteristics of strong cooling capacity of water and weak cooling capacity of air are utilized, and the cooling control time is accurately optimized through repeated strong and weak alternate cooling of water and air, so that the metallographic phase does not stay in a pearlite area and a bainite area in a CCT curve in the structure transformation process, pearlite and bainite are not generated, the structure of a steel ingot is more refined, and the toughness of a steel structure material is improved. When the cooling time is calculated, the maximum effective thickness is selected according to the shape of the steel ingot, the diameter of the round steel can be adopted by the round steel ingot, and the height of the flat steel is adopted by the flat steel ingot, wherein the unit is millimeter.
The invention also provides a heat treatment method of the die steel, which comprises the following steps: the steel ingot is sequentially treated according to the following steps: hot forging and rolling, air blowing and cooling, heating, alternately cooling in water and air, and spheroidizing annealing; wherein, the water-air alternative cooling adopts the cooling method in the heat treatment process of the die steel.
The heat treatment method of the die steel carries out hot forging rolling on the steel ingot to enable the steel ingot to be roughly processed and formed, then air blowing cooling is carried out to enable the steel ingot after hot forging rolling processing to be rapidly cooled, crystal grains are refined, then heating is carried out to enable the steel ingot to be austenitized, water-air alternate cooling is carried out continuously, alloy tissues of the steel ingot are refined, further, stress of a workpiece in the water-air alternate cooling process is eliminated through spheroidizing annealing, and the refined tissue crystal grains are recrystallized.
The final temperature of the hot forging and rolling of the steel ingot can be preferably higher than the precipitation temperature of secondary carbides in a CCT curve so as to prevent the generation of the secondary carbides, the specific temperature range can be selected according to different grades of steel, and if the steel ingot is H11 steel, the final temperature of the hot forging and rolling is controlled to be higher than 805 ℃; if the steel is H12 steel, controlling the finish temperature of hot forging rolling to be above 810 ℃; if the steel is 5H12 steel, the final temperature of the hot forging rolling is controlled at 815 ℃; if the steel is H13 steel, the finish temperature of hot forging rolling is controlled to be more than 820 ℃.
Then the temperature of the steel ingot after air blowing and cooling is 230-250 ℃, the concrete method can be that the steel ingot is placed on a steel rail with the height of 10-15mm, an axial flow fan is placed around the steel ingot in the east-west and south-north directions, the air outlet direction of the east-west fan is parallel to the air outlet direction with the distance of 10-20mm, and the south-north fan is also started to make the air around the steel ingot flow to form a spiral shape, so that the steel ingot is forced to cool to 230-250 ℃ in a short time, crystal grains can be refined through air blowing and cooling, and the mixed crystal phenomenon generated by dynamic recrystallization in the hot forging and rolling process is reduced.
Further, the steel ingot is heated, and the heating method preferably specifically includes: preheating a heating furnace to 300-400 ℃ in advance to prevent steel ingots from cracking in the furnace, then putting the steel ingots into the heating furnace, preserving heat for 1.5 hours after the steel ingots are put into the furnace, further heating the steel ingots to 600-680 ℃ at a speed of 90-100 ℃/h, and preserving heat for 2-3 hours; and continuously heating the steel ingot to 1030-1050 ℃ at the speed of 90-100 ℃/h, austenitizing the steel ingot, and preserving the heat for 2-3h. And after heating, alternately cooling the steel ingot by water and air to refine the steel ingot structure.
And then spheroidizing annealing is carried out on the steel ingot, wherein the spheroidizing annealing method specifically comprises the following steps: heating the steel ingot to 600-680 ℃ at a speed of 90-100 ℃/h, and preserving heat for 3.5-4.5h; heating the steel ingot to 800-900 ℃ at the speed of 90-100 ℃/h, and preserving the heat for 8.5-9.5h; cooling the steel ingot to 600-680 ℃ at the speed of less than or equal to 30 ℃/h; heating the steel ingot to 700-720 ℃ at the speed of 90-100 ℃/h, and preserving the heat for 11-13 hours; cooling the steel ingot to below 400 ℃ at the speed of less than or equal to 20 ℃/h, and discharging. Spheroidizing annealing can refine grains, adjust the structure and eliminate the structure defects.
The invention further provides the die steel which is prepared from the steel ingot by the heat treatment method of the die steel. By adopting the heat treatment method, the die steel can refine the steel structure and improve the toughness of steel structure materials.
Specific embodiments of the present invention are described in detail below.
Example one
The steel ingot adopted in the embodiment is a bar material with the material H13, the specification phi 254 and the length 5000 mm. The following heat treatment method was used for the steel ingot.
Heating the steel ingot to 1150 ℃ and then forging the steel ingot in a radial direction, wherein the temperature of the finish forging degree is controlled to 820 ℃.
The steel ingot is placed on a steel rail with the height of 10-15mm after hot forging, an axial flow fan is respectively placed around the steel ingot in the east, the west, the south and the north, the fans are not opposite, the fans are staggered by 10-20mm, and the steel ingot is forced to be cooled to 250 ℃.
Putting the steel ingot cooled by air blowing into a heating furnace preheated to 350 ℃, preserving heat for 1.5 hours after the steel ingot is put into the furnace, raising the temperature to 650 ℃ at the speed of 90-100 ℃/h, and preserving heat for 2.5 hours; and continuously heating the steel ingot to 1050 ℃ at the speed of 90-100 ℃/h, and preserving the heat for 2.5h.
And then alternately cooling with water and air, wherein the first water inlet stays for 9min, the outlet stays for 3min, the second water inlet stays for 6min, the outlet stays for 3min, the third water inlet stays for 1.5min, and the outlet stays for 30min. The surface temperature of the primary water outlet bar is 320 ℃, the surface temperature of the secondary water outlet bar is 230 ℃, and the surface temperature of the tertiary water outlet bar is 110 ℃.
Putting the steel ingot into a heating furnace, heating to 650 ℃ at the speed of 90-100 ℃/h, and preserving heat for 4h; continuously heating the steel ingot to 900 ℃ at the speed of 90-100 ℃/h, and preserving the heat for 9h; then rapidly cooling the steel ingot to 650 ℃ at the speed of less than or equal to 30 ℃/h; heating the steel ingot from 650 ℃ to 700 ℃ at the speed of 90-100 ℃/h, and keeping the temperature for 12 hours; slowly cooling the steel ingot to 400 ℃ from 700 ℃ at a temperature of less than or equal to 20 ℃/h, and discharging.
And straightening and turning the steel ingot. And (3) detecting the annealed structures at 1/4D and 1/2D positions of the steel ingot, taking a sample of 10-15mm, and evaluating the structure metallographic phase at 1/2D position according to SEP1614-1996 standard as shown in figure 1, wherein the annealed structure in the embodiment is GA2 grade.
Example two
The steel ingot adopted in the embodiment is flat steel with the material H12, the specification of 110X250 and the length of 3000 mm. The following heat treatment method was used for the steel ingot.
Heating the steel ingot to 1120 ℃, then forging the steel ingot in a radial direction, and controlling the final forging degree to be 810 ℃.
Hot forging a steel ingot, placing the steel ingot on a steel rail with the height of 10-15mm, respectively placing an axial flow fan around the steel ingot in the east, the west, the south and the north, wherein the fans are not opposite and are staggered by 10-20mm, and forcibly cooling the steel ingot to 230 ℃.
Putting the steel ingot cooled by air blowing into a heating furnace preheated to 350 ℃, preserving heat for 1.5 hours after the steel ingot is put into the furnace, raising the temperature to 650 ℃ at the speed of 90-100 ℃/h, and preserving heat for 2.5 hours; and continuously heating the steel ingot to 1050 ℃ at the speed of 90-100 ℃/h, and preserving the heat for 2.5h.
And then alternately cooling with water and air, wherein the first water inlet stays for 4min, the outlet stays for 1min, the second water inlet stays for 2.5min, the outlet stays for 1min, the third water inlet stays for 1.5min, and the outlet stays for 30min. The surface temperature of the primary water outlet flat steel is 270 ℃, the surface temperature of the secondary water outlet bar is 210 ℃, and the surface temperature of the tertiary water outlet bar is 100 ℃.
Putting the steel ingot into a heating furnace, heating to 650 ℃ at the speed of 90-100 ℃/h, and preserving heat for 4h; continuously heating the steel ingot to 900 ℃ at the speed of 90-100 ℃/h, and keeping the temperature for 9h; then rapidly cooling the steel ingot to 650 ℃ at the speed of less than or equal to 30 ℃/h; heating the steel ingot from 650 ℃ to 700 ℃ at the speed of 90-100 ℃/h, and keeping the temperature for 12 hours; slowly cooling the steel ingot which is less than or equal to 20 ℃/h from 700 ℃ to 400 ℃ and discharging.
And straightening and turning the steel ingot. And (3) detecting the annealing structures of 1/4D and 1/2D of the steel ingot, taking a sample of 10-15mm, and evaluating the structure metallographic phase at the 1/2D position according to SEP1614-1996 standard as shown in figure 1, wherein the annealing structure of the embodiment is GA2 grade.
Comparative example 1
The steel ingot adopted by the comparative example is a bar material with the material H13, the specification phi 254 and the length 5000 mm. The following heat treatment method was used for the steel ingot.
The ingot was heated to 1150 ℃ and radially forged, with the finish forging temperature controlled at 820 ℃.
The steel ingot is placed on a steel rail with the height of 10-15mm after hot forging, an axial flow fan is respectively placed around the steel ingot in the east, the west, the south and the north, the fans are not opposite, the fans are staggered by 10-20mm, and the steel ingot is forced to be cooled to 250 ℃.
Putting the steel ingot cooled by air blowing into a heating furnace preheated to 350 ℃, keeping the temperature for 1.5 hours after the steel ingot is put into the furnace, raising the temperature to 650 ℃ at the speed of 90-100 ℃/h, and keeping the temperature for 2.5 hours; and continuously heating the steel ingot to 1050 ℃ at the speed of 90-100 ℃/h, and preserving the heat for 2.5h.
And then alternately cooling with water and air, wherein the water stays for 4min for the first time, stays for 1min in the air for the second time, stays for 1.5min for the second time, stays for 1min in the air for the third time, and stays for 30min in the air. The surface temperature of the primary water outlet bar is 480 ℃, the surface temperature of the secondary water outlet bar is 360 ℃, and the surface temperature of the tertiary water outlet bar is 230 ℃.
Putting the steel ingot into a heating furnace, heating to 650 ℃ at the speed of 90-100 ℃/h, and preserving heat for 4h; continuously heating the steel ingot to 900 ℃ at the speed of 90-100 ℃/h, and preserving the heat for 9h; then rapidly cooling the steel ingot to 650 ℃ at the speed of less than or equal to 30 ℃/h; heating the steel ingot from 650 ℃ to 700 ℃ at a speed of 90-100 ℃/h, and keeping the temperature for 12 hours; slowly cooling the steel ingot which is less than or equal to 20 ℃/h from 700 ℃ to 400 ℃ and discharging.
And straightening and turning the steel ingot. The 1/4D and 1/2D annealed structures were examined, 10-15mm samples were taken, and the metallographic structure at 1/2D was as shown in FIG. 3. The comparative example is substantially the same as the heat treatment method of example one except for the time of alternately cooling with water and air. After the water-air alternative cooling time is changed, a large amount of bainite appears in the structure, which does not meet the standard regulation of SEP1614-1996, and the service life of the steel ingot is greatly reduced.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that, in the above embodiments, the various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations.
Claims (7)
1. A cooling method in the heat treatment process of die steel is characterized by comprising the following steps:
the method comprises the steps of alternately cooling a steel ingot by water and cooling the steel ingot by air;
the first water cooling time is the maximum effective thickness of the steel ingot (2.0-2.2) s/mm;
the first air cooling time is the maximum effective thickness of the steel ingot (0.60-0.8) s/mm;
the second water cooling time is the maximum effective thickness of the steel ingot (1.3-1.5) s/mm;
the second air cooling time is the maximum effective thickness of the steel ingot (0.60-0.80) s/mm;
the third water cooling time is the maximum effective thickness of the steel ingot (0.28-0.48) s/mm;
the third air cooling time is 30-40 min.
2. A method of heat treating die steel, the method comprising:
the steel ingot is sequentially treated according to the following steps: hot forging and rolling, air blowing and cooling, heating, alternately cooling in water and air, and spheroidizing annealing;
wherein, the water-air alternative cooling adopts the cooling method in the heat treatment process of the die steel as claimed in claim 1.
3. The heat treatment method of die steel according to claim 2, characterized in that:
and the final temperature of the hot forging and rolling of the steel ingot is above the precipitation temperature of secondary carbides in a CCT curve.
4. The heat treatment method of die steel according to claim 2, characterized in that:
the temperature of the steel ingot after air-blowing cooling is 230-250 ℃.
5. The heat treatment method of die steel according to claim 2, characterized in that:
the heating method comprises the following steps:
heating the steel ingot to 600-680 ℃ at the speed of 90-100 ℃/h, and preserving heat for 2-3h;
and then heating the steel ingot to 1030-1050 ℃ at the speed of 90-100 ℃/h, and preserving the heat for 2-3h.
6. A method of heat treating die steel according to any one of claims 2 to 5, characterized in that:
the spheroidizing annealing method comprises the following steps:
heating the steel ingot to 600-680 ℃ at the speed of 90-100 ℃/h, and preserving heat for 3.5-4.5h;
heating the steel ingot to 800-900 ℃ at the speed of 90-100 ℃/h, and preserving heat for 8.5-9.5h;
cooling the steel ingot to 600-680 ℃ at a speed of less than or equal to 30 ℃/h;
heating the steel ingot to 700-720 ℃ at the speed of 90-100 ℃/h, and preserving heat for 11-13 hours;
and cooling the steel ingot to below 400 ℃ at a speed of less than or equal to 20 ℃/h, and discharging.
7. A die steel is characterized in that: produced from a steel ingot by a heat treatment method of a die steel according to any one of claims 2 to 6.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211294759.6A CN115584386A (en) | 2022-10-21 | 2022-10-21 | Cooling method in die steel heat treatment process, heat treatment method of die steel and die steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211294759.6A CN115584386A (en) | 2022-10-21 | 2022-10-21 | Cooling method in die steel heat treatment process, heat treatment method of die steel and die steel |
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| CN115584386A true CN115584386A (en) | 2023-01-10 |
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| CN202211294759.6A Pending CN115584386A (en) | 2022-10-21 | 2022-10-21 | Cooling method in die steel heat treatment process, heat treatment method of die steel and die steel |
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